Caz, btdubs. Crack. Set while Jack was traveling with nine and rose. In my opinion, Jack was the only worthwhile character in that past sentence.
Jack crept silently through the TARDIS, towards where he knew the Doctor's room was, judging by what the TARDIS herself had told him telepathically. He wasn't really sure what he'd find there, but he was bored, and in need of entertainment.
Maybe, Jack hoped, the Doctor would be there, naked, and willing. Of course, seeing the looks the man shared with his blonde companion, that didn't seem likely. Jack didn't mind, if he was quiet enough, he might find Rose and the Doc going at it. Though he'd prefer to be in the action himself, Jack never did mind a show.
An empty room would be alright as well. Jack had always wondered what treasures and trinkets littered the Doctor's pockets, what a man like him would fill his room with. But he wouldn't have to wonder anymore, the Doctor would be waiting just around this one last corner…
Jack slowly and silently turned the knob, relieved to find the door unlocked. He cracked it, peeking his head in.
"Oh, hello Jack." Frantic turquois eyes met gleeful ice blue as Jack looked up in alarm- half guilty, half curious. The Doctor peered at the Boeshanian from behind a book.
"Doctor, is that what I think it is?"
"If you're thinking it's a book, then yes."
"Sorry, it's just- not what I'd… expect you to be reading."
The Doctor grinned. "Why not?"
"Well, you just don't seem like a 'Harry Potter' sort of guy."